(a(i))[1]
State one source from which lead compounds enter the air.
(a(ii))[1]
State one harmful effect of lead compounds on health.
(b)[2]
Use the information in the table to arrange the four metals in order of reactivity, with the least reactive first.
(c)[1]
Use the diagram to explain why graphite is used as a lubricant.
(d)[1]
Name the gas.
(e)[1]
Which one of these pH values is the pH of a slightly acidic solution? Draw a circle round the correct answer. pH 6 pH 7 pH 8 pH 10
(f(i))[1]
Name one additional major greenhouse gas.
(f(ii))[1]
State one environmental effect of greenhouse gases.